US3592531A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Split dagor-type of symmetrical copying lens system
Assignee: Xerox Corp
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Filing: 1970-03-26
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Granted: 1971-07-13
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Expires: 1990-03-26
Abstract
Abstract A Split Dagor-type of symmetrical copying lens system having front and back compound lens components with a centrally located diaphragm therebetween adapted to an optical system of a copier which can be used at both 1:1 and 1:1.6 magnifications, and all magnifications therebetween. The front lens component has three lens elements including, in the following order, a first lens element of positive power, a second lens element of negative power cemented to the first lens element and a third lens element of positive power disposed between the second lens element and diaphragm, and the back lens component having three similar lens elements positioned so that the lens system is symmetrical.
Inventors
- 👤 George L Mccrobie
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 22:23
CPC Classifications
G; G02; G02B; G02B13/00; G02B13/24
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
360 words
A symmetrical Split Dagor type of copying lens system having an aperture of substantially f(4.5) and magnifying the image formed thereby between 1X and 1.6X, said lens system being corrected for spherical aberration and chromatic aberration including secondary color, lateral and longitudinal chromatism, coma, astigmatism, distortion and field curvature, comprising: a. a front compound component including lens elements I, II, and III between the optical plane and diaphragm, b. a back compound component including lens elements IV, V, and VI between the diaphragm and image plane, c. the two outer lens elements I and VI being of equal positive power and being placed in a symmetrical manner about the diaphragm, the two inner lens elements III and IV being equal positive power and being placed adjacent to the diaphragm in a symmetrical manner about the diaphragm, and lens elements II and V being of equal negative power, lens element II being placed between lens elements I and III and cemented to lens element I and lens element V being placed between lens elements IV and VI and cemented to lens element VI, d. the front compound component having a focal length between 1.530F and 1.545F and the back component having a focal length between 1.530F and 1.545F, while F represents the equivalent focal length of the lens system, and e. the constructional data relating to the lens system having comprehensive values is given in the table herebelow wherein S2 designates the air space between lens element II and III, S3 designates the air space between lens element III and the diaphragm, S4 designates the air space between the diaphragm and lens element IV, and S5 designates the air space between lens elements IV aNd V, T1 to T6 designate the axial thickness of successive lens elements I to VI, R1 to R10 designate radii of the successive lens surfaces numbering from the first radii in the front component of the lens, the minus (-) sign used with certain R values to define that the surfaces are concave towards incident light, and the refractive index and Abbe number of the glasses in said lens element being designated respectively Nd and v:
Claim 2
Dependent Claim
360 words
A symmetrical Split Dagor type of copying lens system having an aperture of substantially f(4.5) and magnifying the image formed thereby between 1X and 1.6X, said lens system being corrected for spherical aberration and chromatic aberration including secondary color, lateral and longitudinal chromatism, coma, astigmatism, distortion and field curvature, comprising: a. a front compound component including lens elements I, II, and III between the optical plane and diaphragm, b. a back compound component including lens elements IV, V, and VI between the diaphragm and image plane, c. the two outer lens elements I and VI being of equal positive power and being placed in a symmetrical manner about the diaphragm, the two inner lens elements III and IV being equal positive power and being placed adjacent to the diaphragm in a symmetrical manner about the diaphragm, and lens elements II and V being of equal negative power, lens element II being placed between lens elements I and III and cemented to lens element I and lens element V being placed between lens elements IV and VI and cemented to lens element VI, d. the front compound component having a focal length between 1.530F and 1.545F and the back component having a focal length between 1.530F and 1.545F, while F represents the equivalent focal length of the lens system, and e. the constructional data relating to the lens system having comprehensive values is given in the table herebelow wherein S2 designates the air space between lens element II and III, S3 designates the air space between lens element III and the diaphragm, S4 designates the air space between the diaphragm and lens element IV, and S5 designates the air space between lens elements IV aNd V, T1 to T6 designate the axial thickness of successive lens elements I to VI, R1 to R10 designate radii of the successive lens surfaces numbering from the first radii in the front component of the lens, the minus (-) sign used with certain R values to define that the surfaces are concave towards incident light, and the refractive index and Abbe number of the glasses in said lens element being designated respectively Nd and v:
Claim 3
Dependent Claim
248 words
A symmetrical Split Dagor type of copying lens system having an aperture of substantially f(4.5) and magnifying the image formed thereby between 1X and 1.6X, said lens system being corrected for spherical aberration and chromatic aberration including secondary color, lateral and longitudinal chromatism, coma, astigmatism, distortion and field curvature, comprising: a. a front compound component including lens elements I, II, and III between the object plane and diaphragm, b. a back compound component including lens elements IV, V and VI between the diaphragm and image plane, c. the two outer lens elements I and VI being of equal positive power and being placed in a symmetrical manner about the diaphragm, the two inner lens elements III and IV being equal positive power and being placed adjacent the diaphragm in a symmetrical manner about the diaphragm, and lens elements II and V being of equal negative power, lens element II being placed between lens elements I and III and cemented to lens element I and lens element V being placed between lens element IV and VI and cemented to lens element VI, d. the numerical values for the constructional data of the lens system being given in the chart herebelow wherein R1 to R10 represent the radii of curvatures of successive lens surfaces, and the minus (-) sign used therewith signifies the radius of the designated surface has its center of curvature located on the entrance side of the lens system with respect to the vertex of said surface
Claim 4
Dependent Claim
248 words
A symmetrical Split Dagor type of copying lens system having an aperture of substantially f(4.5) and magnifying the image formed thereby between 1X and 1.6X, said lens system being corrected for spherical aberration and chromatic aberration including secondary color, lateral and longitudinal chromatism, coma, astigmatism, distortion and field curvature, comprising: a. a front compound component including lens elements I, II, and III between the object plane and diaphragm, b. a back compound component including lens elements IV, V and VI between the diaphragm and image plane, c. the two outer lens elements I and VI being of equal positive power and being placed in a symmetrical manner about the diaphragm, the two inner lens elements III and IV being equal positive power and being placed adjacent the diaphragm in a symmetrical manner about the diaphragm, and lens elements II and V being of equal negative power, lens element II being placed between lens elements I and III and cemented to lens element I and lens element V being placed between lens element IV and VI and cemented to lens element VI, d. the numerical values for the constructional data of the lens system being given in the chart herebelow wherein R1 to R10 represent the radii of curvatures of successive lens surfaces, and the minus (-) sign used therewith signifies the radius of the designated surface has its center of curvature located on the entrance side of the lens system with respect to the vertex of said surface
Claim 5
Dependent Claim
15 words
The lens system according to claim 2 wherein the lens elements have the following characteristics:
Claim 6
Dependent Claim
15 words
The lens system according to claim 2 wherein the lens elements have the following characteristics:
Claim 7
Dependent Claim
15 words
The lens system according to claim 2 wherein the lens elements have the following characteristics:
Claim 8
Dependent Claim
321 words
A symmetrical Split Dagor type of copying lens system having an aperture of substantially f(5.6) and magnifying the image formed thereby 1X, said lens system being corrected for spherical aberration and chromatic aberration including secondary color, lateral and longitudinal chromatism, coma, astigmatism, distortion and field curvature, comprising: a. a front compound component including lens elements I, II, and III between the optical plane and diaphragm, b. a back compound component including lens elements IV, V, and VI between the diaphragm and image plane, c. the two outer lens elements I and VI being of equal positive power and being placed in a symmetrical manner about the diaphragm, the two inner lens elements III and IV being equal positive power and being placed adjacent to the diaphragm in a symmetrical manner about the diaphragm, and lens elements II and V being of equal negative power, lens element II being placed between lens elements I and III and cemented to lens element I and lens element V being placed between lens elements IV and VI and cemented to lens element VI, and d. the constructional data relating to thE lens system having comprehensive values is given in the table herebelow wherein S2 designates the air space between lens element II and III, S3 designates the air space between lens element III and the diaphragm, S4 designates the air space between the diaphragm and lens element IV, and S5 designates the air space between lens elements IV and V, T1 to T6 designate the axial thickness of successive lens elements I to VI, R1 to R10 designate radii of the successive lens surfaces numbering from the first radii in the front component of the lens, the minus (-) sign used with certain R values to define that the surfaces are concave towards incident light, and the refractive index and Abbe number of the glasses in said lens element being designated respectively Nd and v:
Claim 9
Dependent Claim
321 words
A symmetrical Split Dagor type of copying lens system having an aperture of substantially f(5.6) and magnifying the image formed thereby 1X, said lens system being corrected for spherical aberration and chromatic aberration including secondary color, lateral and longitudinal chromatism, coma, astigmatism, distortion and field curvature, comprising: a. a front compound component including lens elements I, II, and III between the optical plane and diaphragm, b. a back compound component including lens elements IV, V, and VI between the diaphragm and image plane, c. the two outer lens elements I and VI being of equal positive power and being placed in a symmetrical manner about the diaphragm, the two inner lens elements III and IV being equal positive power and being placed adjacent to the diaphragm in a symmetrical manner about the diaphragm, and lens elements II and V being of equal negative power, lens element II being placed between lens elements I and III and cemented to lens element I and lens element V being placed between lens elements IV and VI and cemented to lens element VI, and d. the constructional data relating to thE lens system having comprehensive values is given in the table herebelow wherein S2 designates the air space between lens element II and III, S3 designates the air space between lens element III and the diaphragm, S4 designates the air space between the diaphragm and lens element IV, and S5 designates the air space between lens elements IV and V, T1 to T6 designate the axial thickness of successive lens elements I to VI, R1 to R10 designate radii of the successive lens surfaces numbering from the first radii in the front component of the lens, the minus (-) sign used with certain R values to define that the surfaces are concave towards incident light, and the refractive index and Abbe number of the glasses in said lens element being designated respectively Nd and v:
Claim 10
Dependent Claim
321 words
A symmetrical Split Dagor type of copying lens system having an aperture of substantially f(5.6) and magnifying the image formed thereby 1X, said lens system being corrected for spherical aberration and chromatic aberration including secondary color, lateral and longitudinal chromatism, coma, astigmatism, distortion and field curvature, comprising: a. a front compound component including lens elements I, II, and III between the optical plane and diaphragm, b. a back compound component including lens elements IV, V, and VI between the diaphragm and image plane, c. the two outer lens elements I and VI being of equal positive power and being placed in a symmetrical manner about the diaphragm, the two inner lens elements III and IV being equal positive power and being placed adjacent to the diaphragm in a symmetrical manner about the diaphragm, and lens elements II and V being of equal negative power, lens element II being placed between lens elements I and III and cemented to lens element I and lens element V being placed between lens elements IV and VI and cemented to lens element VI, and d. the constructional data relating to the lens system having comprehensive values is given in the table herebelow wherein S2 designates the air space between lens element II and III, S3 designates the air space between lens element III and the diaphragm, S4 designates the air space between the diaphragm and lens element IV, and S5 designates the air space between lens elements IV and V, T1 to T6 designate the axial thickness of successive lens elements I to VI, R1 to R10 designate radii of the successive lens surfaces numbering from the first radii in the front component of the lens, the minus (-) sign used with certain R values to define that the surfaces are concave towards incident light, and the refractive index and Abbe number of the glasses in said lens element being designated respectively Nd and v:
Claim 11
Dependent Claim
321 words
A symmetrical Split Dagor type of copying lens system having an aperture of substantially f(5.6) and magnifying the image formed thereby 1X, said lens system being corrected for spherical aberration and chromatic aberration including secondary color, lateral and longitudinal chromatism, coma, astigmatism, distortion and field curvature, comprising: a. a front compound component including lens elements I, II, and III between the optical plane and diaphragm, b. a back compound component including lens elements IV, V, and VI between the diaphragm and image plane, c. the two outer lens elements I and VI being of equal positive power and being placed in a symmetrical manner about the diaphragm, the two inner lens elements III and IV being equal positive power and being placed adjacent to the diaphragm in a symmetrical manner about the diaphragm, and lens elements II and V being of equal negative power, lens element II being placed between lens elements I and III and cemented to lens element I and lens element V being placed between lens elements IV and VI and cemented to lens element VI, and d. the constructional data relating to the lens system having comprehensive values is given in the table herebelow wherein S2 designates the air space between lens element II and III, S3 designates the air space between lens element III and the diaphragm, S4 designates the air space between the diaphragm and lens element IV, and S5 designates the air space between lens elements IV and V, T1 to T6 designate the axial thickness of successive lens elements I to VI, R1 to R10 designate radii of the successive lens surfaces numbering from the first radii in the front component of the lens, the minus (-) sign used with certain R values to define that the surfaces are concave towards incident light, and the refractive index and Abbe number of the glasses in said lens element being designated respectively Nd and v:
References Cited (Backward Citations)
US3418038A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-07-12 | 1975-01-11 | 1975-07-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-12 | 1979-01-11 | 1979-07-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-12 | 1983-01-11 | 1983-07-13 | $7700.00 | Window Closed / Lapsed |